diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9eadf5fe..9c28c1b1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,90 +4,11 @@ concurrency:
   group: test-${{ github.ref }}
   cancel-in-progress: true
 jobs:
-  test-cxx:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: ubuntu-20.04
-            cxx: g++-9
-            extras: enabled
-          - os: ubuntu-22.04
-            cxx: g++-12
-            extras: enabled
-          - os: ubuntu-20.04
-            cxx: clang++-10
-            extras: enabled
-          - os: ubuntu-22.04
-            cxx: clang++-14
-            extras: enabled
-          - os: macos-14
-            cxx: clang++
-            extras: disabled
-    runs-on: ${{ matrix.os }}
-    env:
-      SCCACHE_GHA_ENABLED: "true"
-      CXX: sccache ${{ matrix.cxx }}
-      # Don't error on deprecations: Xcode marks sprintf deprecated and Boost references it
-      CXXFLAGS: -Wno-error=deprecated-declarations
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up sccache
-        uses: mozilla-actions/sccache-action@v0.0.5
-      - name: Install system packages
-        run: ./.ci/install-sys-pkgs.sh
-      - uses: actions/setup-python@v5
-        with:
-          # 3.10 is the minimum version supported on macos-14 builders
-          python-version: '3.10'
-          cache: 'pip'
-      - name: Install build requirements
-        run: ./.ci/py-build-requirements.sh
-      - name: Set up build directory
-        run: >-
-          meson setup build
-          --native-file=ci.ini
-          -Dwerror=true
-          -Dauto_features=${{ matrix.extras }}
-          -Dcuda=disabled
-          -Dgdrapi=disabled
-          -Dfmv="$(if [[ '${{ matrix.cxx }}' == g++* ]]; then echo enabled; else echo disabled; fi)"
-      - name: Build
-        run: meson compile -C build
-      - name: Run tests
-        run: meson test -C build
-
   test-python:
     strategy:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
-            cc: gcc-9
-            cxx: g++-9
-            python-version: '3.8'
-            extras: enabled
-          # Disabled for now because numba/llvmlite (needed for tests)
-          # doesn't have a pypy wheel, and it's not worth the effect to
-          # install all the dependencies needed to make that work.
-          # - os: ubuntu-22.04
-          #   cxx: g++
-          #   python-version: pypy-3.7
-          - os: ubuntu-22.04
-            cc: gcc-12
-            cxx: g++-12
-            python-version: '3.12'
-            extras: enabled
-          - os: ubuntu-20.04
-            cc: clang-10
-            cxx: clang++-10
-            python-version: '3.12'
-            extras: enabled
-          - os: ubuntu-22.04
-            cc: clang-14
-            cxx: clang++-14
-            python-version: '3.12'
-            extras: enabled
           - os: macos-14
             cc: clang
             cxx: clang++
@@ -100,6 +21,10 @@ jobs:
       # Don't error on deprecations: Xcode marks sprintf deprecated and Boost references it
       CXXFLAGS: -Wno-error=deprecated-declarations
     steps:
+      - name: Show environment
+        run: env
+      - name: Test running cargo
+        run: cargo --version
       - uses: actions/checkout@v4
       - name: Set up sccache
         uses: mozilla-actions/sccache-action@v0.0.5
@@ -126,155 +51,12 @@ jobs:
       - name: Run shutdown tests
         run: ./.ci/py-tests-shutdown.sh
 
-  lint:
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          cache: 'pip'
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.8'
-          cache: 'pip'
-      - run: pip install pre-commit
-      - run: pre-commit run --all-files
-
-  coverage:
-    runs-on: ubuntu-22.04
-    env:
-      SCCACHE_GHA_ENABLED: "true"
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up sccache
-        uses: mozilla-actions/sccache-action@v0.0.5
-      - name: Install system packages
-        run: ./.ci/install-sys-pkgs.sh
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          cache: 'pip'
-      - name: Install Python dependencies
-        run: ./.ci/py-requirements.sh
-      - name: Install build requirements
-        run: ./.ci/py-build-requirements.sh
-      - name: Install Python package
-        # Build isolation tends to delete the .gcno files which end up in
-        # the ephemeral build directory. So do a non-isolated editable
-        # install instead.
-        run: >-
-          pip install -v
-          --config-settings=setup-args=-Dwerror=true
-          --config-settings=setup-args=-Dauto_features=enabled
-          --config-settings=setup-args=-Dbuildtype=debug
-          --config-settings=setup-args=-Db_coverage=true
-          --no-build-isolation
-          --editable .
-      - name: Run Python tests
-        run: pytest -v -ra && ./.ci/py-tests-shutdown.sh
-      - name: Set up C++ build
-        run: >-
-          meson setup build
-          -Dwerror=true
-          -Dauto_features=enabled
-          -Dcuda=disabled
-          -Dgdrapi=disabled
-          -Dbuildtype=debug
-          -Db_coverage=true
-      - name: Build C++
-        run: meson compile -C build
-      - name: Run C++ tests
-        run: meson test -C build
-      - name: Collect coverage
-        run: ./.ci/coverage.sh
-      - uses: coverallsapp/github-action@v2.3.0
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: lcov.info
-
-  all-builds:
-    runs-on: ubuntu-22.04
-    env:
-      SCCACHE_GHA_ENABLED: "true"
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          cache: 'pip'
-      - uses: actions/checkout@v4
-      - name: Set up sccache
-        uses: mozilla-actions/sccache-action@v0.0.5
-      - name: Install system packages
-        run: ./.ci/install-sys-pkgs.sh
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          cache: 'pip'
-      - name: Install build requirements
-        run: ./.ci/py-build-requirements.sh
-      - name: Build all the combinations
-        run: ./.ci/all-builds.sh
-
-  sdist:
-    needs: [test-cxx, test-python, coverage, lint]
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          cache: 'pip'
-      - name: Install system packages
-        run: ./.ci/install-sys-pkgs.sh
-      - name: Install Python dependencies
-        run: ./.ci/py-requirements.sh
-      - run: pip install build==0.10.0
-      - run: python -m build --sdist .
-      - uses: actions/upload-artifact@v4
-        with:
-          name: sdist
-          path: ./dist/*.tar.gz
-
-  cibuildwheel-linux:
-    needs: [test-cxx, test-python, coverage, lint]
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-      matrix:
-        arch: [x86_64, aarch64]
-        python: [cp38, cp39, cp310, cp311, cp312]
-    env:
-      SCCACHE_GHA_ENABLED: "true"
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up sccache
-        uses: mozilla-actions/sccache-action@v0.0.5
-      - uses: docker/setup-qemu-action@v3
-        with:
-          platforms: arm64
-        if: matrix.arch != 'x86_64'
-      - uses: pypa/cibuildwheel@v2.19.2
-        env:
-          CIBW_ARCHS: ${{ matrix.arch }}
-          CIBW_BUILD: ${{ matrix.python }}-manylinux*
-      - uses: actions/upload-artifact@v4
-        with:
-          name: wheel_linux-${{ matrix.arch }}-${{ matrix.python }}
-          path: ./wheelhouse/*.whl
-      - uses: actions/upload-artifact@v4
-        with:
-          name: debug_symbols_uncompressed-${{ matrix.arch }}-${{ matrix.python }}
-          path: ./wheelhouse/*.debug
-
   cibuildwheel-macos:
-    needs: [test-cxx, test-python, coverage, lint]
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-13, macos-14]
-        python: [cp38, cp39, cp310, cp311, cp312]
+        os: [macos-14]
+        python: [cp312]
         exclude:
           # Python 3.8 not natively available for Apple Silicon. cibuildwheel
           # tries to do a cross build, which fails.
@@ -284,6 +66,10 @@ jobs:
     env:
       SCCACHE_GHA_ENABLED: "true"
     steps:
+      - name: show environment
+        run: env
+      - name: try running cargo
+        run: cargo --version
       - uses: actions/checkout@v4
       - name: Set up sccache
         uses: mozilla-actions/sccache-action@v0.0.5
@@ -294,36 +80,3 @@ jobs:
         with:
           name: wheel_macos-${{ matrix.os }}-${{ matrix.python }}
           path: ./wheelhouse/*.whl
-
-  combine:
-    needs: [cibuildwheel-linux, cibuildwheel-macos, sdist]
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-      - name: Create paths
-        run: mkdir -p debug-symbols dist wheelhouse
-      - uses: actions/download-artifact@v4
-        with:
-          pattern: debug_symbols_uncompressed-*
-          path: .
-          merge-multiple: true
-      - uses: actions/download-artifact@v4
-        with:
-          pattern: wheel_*
-          path: wheelhouse/
-          merge-multiple: true
-      - uses: actions/download-artifact@v4
-        with:
-          name: sdist
-          path: dist/
-          merge-multiple: true
-      - name: Compress debug symbols
-        run: >-
-          tar -Jcvf debug-symbols/"spead2-"$(<VERSION.txt)-debug.tar.xz _spead2*.debug
-      - uses: actions/upload-artifact@v4
-        with:
-          name: combined
-          path: |
-            debug-symbols/
-            dist/
-            wheelhouse/